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/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _M_XFORM_H
#define _M_XFORM_H
#include "util/compiler.h"
#include "main/glheader.h"
#include "math/m_matrix.h"
#include "math/m_vector.h"
extern void
_math_init_transformation(void);
extern void
init_c_cliptest(void);
/* KW: Clip functions now do projective divide as well. The projected
* coordinates are very useful to us because they let us cull
* backfaces and eliminate vertices from lighting, fogging, etc
* calculations. Despite the fact that this divide could be done one
* day in hardware, we would still have a reason to want to do it here
* as long as those other calculations remain in software.
*
* Clipping is a convenient place to do the divide on x86 as it should be
* possible to overlap with integer outcode calculations.
*
* There are two cases where we wouldn't want to do the divide in cliptest:
* - When we aren't clipping. We still might want to cull backfaces
* so the divide should be done elsewhere. This currently never
* happens.
*
* - When culling isn't likely to help us, such as when the GL culling
* is disabled and we not lighting or are only lighting
* one-sided. In this situation, backface determination provides
* us with no useful information. A tricky case to detect is when
* all input data is already culled, although hopefully the
* application wouldn't turn on culling in such cases.
*
* We supply a buffer to hold the [x/w,y/w,z/w,1/w] values which
* are the result of the projection. This is only used in the
* 4-vector case - in other cases, we just use the clip coordinates
* as the projected coordinates - they are identical.
*
* This is doubly convenient because it means the Win[] array is now
* of the same stride as all the others, so I can now turn map_vertices
* into a straight-forward matrix transformation, with asm acceleration
* automatically available.
*/
/* Vertex buffer clipping flags
*/
#define CLIP_RIGHT_SHIFT 0
#define CLIP_LEFT_SHIFT 1
#define CLIP_TOP_SHIFT 2
#define CLIP_BOTTOM_SHIFT 3
#define CLIP_NEAR_SHIFT 4
#define CLIP_FAR_SHIFT 5
#define CLIP_RIGHT_BIT 0x01
#define CLIP_LEFT_BIT 0x02
#define CLIP_TOP_BIT 0x04
#define CLIP_BOTTOM_BIT 0x08
#define CLIP_NEAR_BIT 0x10
#define CLIP_FAR_BIT 0x20
#define CLIP_USER_BIT 0x40
#define CLIP_CULL_BIT 0x80
#define CLIP_FRUSTUM_BITS 0x3f
typedef GLvector4f * (*clip_func)(GLvector4f *vClip,
GLvector4f *vProj,
GLubyte clipMask[],
GLubyte *orMask,
GLubyte *andMask,
GLboolean viewport_z_clip);
typedef void (*dotprod_func)( GLfloat *out,
GLuint out_stride,
const GLvector4f *coord_vec,
const GLfloat plane[4] );
typedef void (*vec_copy_func)( GLvector4f *to,
const GLvector4f *from );
/*
* Functions for transformation of normals in the VB.
*/
typedef void (*normal_func)(const GLmatrix *mat,
GLfloat scale,
const GLvector4f *in,
const GLfloat lengths[],
GLvector4f *dest);
/* Flags for selecting a normal transformation function.
*/
#define NORM_RESCALE 0x1 /* apply the scale factor */
#define NORM_NORMALIZE 0x2 /* normalize */
#define NORM_TRANSFORM 0x4 /* apply the transformation matrix */
#define NORM_TRANSFORM_NO_ROT 0x8 /* apply the transformation matrix */
/* KW: New versions of the transform function allow a mask array
* specifying that individual vector transform should be skipped
* when the mask byte is zero. This is always present as a
* parameter, to allow a unified interface.
*/
typedef void (*transform_func)(GLvector4f *to_vec,
const GLfloat m[16],
const GLvector4f *from_vec);
extern dotprod_func _mesa_dotprod_tab[5];
extern vec_copy_func _mesa_copy_tab[0x10];
extern vec_copy_func _mesa_copy_clean_tab[5];
extern clip_func _mesa_clip_tab[5];
extern clip_func _mesa_clip_np_tab[5];
extern normal_func _mesa_normal_tab[0xf];
/* Use of 2 layers of linked 1-dimensional arrays to reduce
* cost of lookup.
*/
extern transform_func *_mesa_transform_tab[5];
#define TransformRaw( to, mat, from ) \
( _mesa_transform_tab[(from)->size][(mat)->type]( to, (mat)->m, from ), \
(to) )
#endif
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